I plugged my adapter into my working 0810 installation and got the same result. Looks like things are trying to work - apparently the device is recognized and assigned to a USB port. The 1-wire software appears to attempt a handshake but can't quite get there. So maybe there is hope for us. I had just about resigned myself to finding a new rs232 adapter.

You only need to had the 1-wire interface in the webmin. Choose the port its connected.You have prewired sensors? No need to add the childs manually. Mine showed up in the webmin after a couple of reboots.

Here are a few pictures. The adapter plugs into the USB port, then a phone cable with sensors plugs into the adapter. I only have one temp sensor on a short pigtail right now, but the house is wired for temp sensing in almost every room. My plan is to use this info to make decisions for the HVAC system.

One of the problems is that the template won't allow me to select the ttyUSB port the adapter is connected to. It only allows me to select ttyS0-3 (rs232 ports).

No luck here either. I rebooted the system. I expected a "some devices failed to load" error but did not get one. I saw the 1-wire device load during the start sequence. So I had some hope, but the template still only has serial ports showing (like in the picture above). I tried

cd usr/pluto/binsh UpdateAvailableSerialPorts.sh It appeared to run without error but the template still showed only rs232 ports. My 1-wire log shows the exact same error 22 that Techstyle reported in post 153. Plugging or unplugging the temp sensor to the adapter has no effect - still get error 22.

By the way, thanks Hari for your help. I know you might have other fish to fry. On the one hand, the 9490R seems like it might be a good piece of hardware for LMCE to support - if you agree I'll do whatever I can to help get the thing to work. On the other hand if this seems a waste of time, I'll just buy a different adapter.